Optical images (left), ¹²CO integrated intensity (moment 0) maps (middle), and ¹²CO intensity-weighted velocity (moment 1) maps (right) of nearby Class II sources associated with RNe, as discussed in Sect. 3. Panel a: HD 142527’s DSS optical image and the ALMA ¹²CO (2–1) moment maps from Garg et al. (2021). Panel b: S CrA’s DSS2 (red) optical image and the ALMA ¹²CO (2–1) moment maps. Solid and dashed curved-cyan lines denote prominent and potential streamer-like features, respectively. Panel c: HD 97048’s DSS optical image and the ALMA ¹²CO (2–1) moment maps. For the moment maps (middle and right) in panel b and c, only pixels with an intensity > 3σ are considered. In these panels, green contours represent continuum emission (∼1.3 mm, 3σ and 15σ levels) from protoplanetary disks, horizontal red lines in the bottom-left corner represent a 1000 au length scale, the grey ellipse in the bottom-right corner represent the beam size, and black contours in moment 1 maps (right) represent moment 0 emission (starting from the error in moment 0, increased by a factor of five). Errors in moment 0 emission are 22.1 and 20.6 mJy beam⁻¹ km s⁻¹ for S CrA and HD 97048, respectively.